What is ISO 12937 - Direct determination of water in petroleum products using coulometric Karl Fischer titration method about?
ISO 12937 specifies a method for the direct determination of water in petroleum products boiling below 390 °C. It covers the mass fraction range 0,003 % (m/m) to 0,100%(m/m). It is not applicable to products containing ketones or to residual fuel oils.
ISO 12937 may be applicable to lubricating base oils. However, precision has not been established for these materials.
The precision given in clause 12 is based upon data obtained using dual-cell, dual-electrolyte systems.
Note 1: A number of substances and classes of compounds associated with condensation or oxidation-reduction reactions interfere in the determination of water by Karl Fischer titration. In petroleum products, the most common interferences are hydrogen sulfide and mercaptan sulfur, however, mass fractions of these below 0,003 % (m/m) as sulfur will not cause significant interference over the range 0,003 % (m/m) to 0,100%(m/m) water. Other organic sulfur compounds commonly present such as sulfides, disulphides and thiophenes, do not interfere.
Note 2: An alternative procedure is provided for information in annex B for the direct determination of water over the range 0,003 % (V/V) to 0,100 % (V/V) in petroleum products. The limitations under which this alternative volume measurement may be used are listed in annex B.
Note 3: ISO 12937 is not applicable to products containing ketones or to residual fuel oils.
Who is ISO 12937 - Direct determination of water in petroleum products using coulometric Karl Fischer titration method for?
ISO 12937 on direct determination of water in petroleum products using coulometric Karl Fischer titration method is useful for:
- Petroleum industry
- Testing laboratories
- Sampling agencies
- Safety bodies
Why should you use ISO 12937 - Direct determination of water in petroleum products using the coulometric Karl Fischer titration method?
Determining water content in petroleum products is essential because it enables you to reduce the damages due to corrosion, deal with safety problems, protect infrastructure from damages caused by such unwanted water traces in the products.
Coulometric Karl Fischer titration method specified in ISO 12937 is used to determine the traces of water in the selected sample, here the petroleum products. The benefit of using this method is the accuracy shown in the results to determine even small amounts of water.
ISO 12937 provides you guidance on sampling petroleum products and determining water in them using the coulometric Karl Fischer titration method with precision and accuracy.